Nested Shulkers
If you have ever played Minecraft for more than a few hours, you know the struggle of inventory management. You build a massive storage room, fill dozens of shulker boxes with loot, and then realize you cannot put those boxes into another box. Vanilla Minecraft has a hard rule: a shulker box cannot go inside another shulker box. This limitation forces players to carry multiple boxes in their inventory, eating up valuable slots. The Nested Shulkers add-on removes that restriction entirely, allowing you to place shulker boxes inside other shulker boxes. This simple change revolutionizes how you organize, transport, and store your items.
What Does Nested Shulkers Do?
This add-on is laser-focused on one thing: letting you nest shulker boxes. It does not alter any other gameplay mechanics. The core features are straightforward and designed to feel like a natural extension of vanilla behavior.
Nest Boxes in the GUI
The primary way to use this feature is through the inventory interface. You can drag a shulker box directly into an open slot of another shulker box, or use shift-click to move it instantly. The game recognizes the action and allows it without any friction. This works for both the player inventory and any container GUI you have open, such as a chest or a hopper.
Works with Automation
This is where Nested Shulkers shines for technical players. Hoppers, droppers, and other item transport systems can now insert shulker boxes into other shulker boxes. This is not a simple patch that only affects the inventory screen. The add-on specifically addresses the two separate code paths that vanilla uses to block nesting. Many mods only fix the inventory check, leaving hoppers stubbornly refusing to insert the item. Nested Shulkers handles both paths, ensuring that your automated sorting systems work flawlessly with nested boxes.
Nothing Else Changes
One of the best aspects of this add-on is its restraint. Only shulker box stacks are affected. Every other item still follows the vanilla insertion rules. Bundles, for example, remain untouched. They still reject shulker boxes exactly like vanilla Minecraft. This means you do not have to worry about unexpected behavior breaking your farms or contraptions.
Nesting Depth Limit Explained
You might be wondering if you can nest boxes infinitely. The answer is no, and there is a very good reason for that. Nesting is capped at 5 levels deep. A plain shulker box is level 1. A box holding a box is level 2, and so on.
This limit is not arbitrary caution. A shulker box carries its contents in the item's data tag. Every level of nesting multiplies the data attached to a single item stack. If left unbounded, a sufficiently nested box would produce a stack too large to send over the network. This would kick players off the server and could even damage the chunk the box is sitting in. Five levels is already an astronomical amount of storage. In fact, a level 5 box holds 531,441 stacks of items inside one single box. That is more than any survival world will ever need.
Currently, the cap is a constant in the source code rather than a config file. If you want a different value, you can change MAX_NESTING_DEPTH in NestedShulkers.java and rebuild the mod. A proper config file is planned for a future update, but for most players, the default limit is more than sufficient.
How to Install Nested Shulkers
Installing this add-on is a breeze. It is built for the Fabric mod loader, which is known for its lightweight and fast performance. Here is a step-by-step guide on how to install it.
- Install Fabric Loader 0.16.0 or newer for Minecraft 1.21.1.
- Download the Nested Shulkers jar file from a trusted source.
- Drop the jar into your
modsfolder.
That is it. You do not need Fabric API for this mod to work, which is a nice bonus for players who want to keep their mod folder minimal. If you are looking for a seamless way to manage your mods, you might consider using a dedicated launcher. For instance, the foxygame.net launcher offers a one-click install feature that automatically places Nested Shulkers into the correct mods folder, saving you the hassle of manual file management.
Multiplayer Considerations
If you plan to use Nested Shulkers on a multiplayer server, you must install it on both the server and the client. The server decides what may be inserted, but the client predicts inventory clicks locally. If you have the mod on the server only, the box will appear to reject the item and snap back before the server corrects it. This creates a frustrating visual glitch where items seem to bounce out of the container. Installing it on both sides ensures a smooth experience for everyone.
Compatibility with Other Mods
The add-on applies two small Mixins that run at the very start of the vanilla checks and return early only for shulker boxes. It does not overwrite any method outright. This means it should sit alongside most other mods without any trouble. The likely exception is another mod that changes the same two shulker box insertion checks. If you encounter a conflict, check the documentation of your other mods to see if they modify shulker box behavior.
For players who use a modpack, this compatibility is a huge relief. You can add Nested Shulkers to your existing setup without worrying about breaking your world. The add-on is licensed under MIT, so you are free to use and modify it as you see fit.
Final Thoughts
Nested Shulkers is a game-changer for inventory management in Minecraft. It solves a long-standing annoyance with a clean, focused solution. Whether you are a casual builder or a technical redstone engineer, this add-on will save you time and frustration. The 5-level depth limit is generous enough for any practical use, and the compatibility with automation makes it a must-have for complex storage systems. If you want to download Nested Shulkers and try it for yourself, make sure you grab the latest version for Minecraft 1.21.1. For an even smoother experience, the foxygame.net launcher includes Nested Shulkers in its add-on catalog, and it also handles version compatibility checks automatically, so you always know you are running the right build. Give it a try, and you will never go back to vanilla shulker box rules again.